Blow-off valve.



No. 646,|04. A APatented Mar. 27, |900. F. M. FABER.

BLOW-UFF VALVE.

(Application led Jan. 1B, 1900.) (Nn Model.)

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PATENT FRANK M. FABER, OF CHICAGO, ILLINOIS.

BLOW-O FF VALVE..

SPECIFICATION formingpart of Letters Patent No. 646,104, dated March 27, 1900.

Application led January 18, 1900. Serial No. 1.878. (No model.)

To a/Z whom, it may concern.-

Beitknown that I, FRANK M. FABER, a citizen of the United States, residing at Chicago, in the county of Cook andState of Illinois, have invented a new and useful Improvement in Blow-Off Valves, of which the following is a speciiication.

The ordinarily-constructed blow-oi vvalve rapidly wears out, for the reason that a large amount of sedimentor scale iscarried through the valve with the water which is blown out of the boiler. This wearing out is due tothe lodgment of some of this sediment on the face of the valve-seat, so that with the closingA down of the disk the hard and gritty particles will be caught between the disk and seat, thus preventing the valve from closing properly and causing leakage. The iluid which is forced through the smallopeniug thus formed rapidly cuts away and destroys both the disk and face of the valve. Moreover, the gritty particles are forced into the seat, thus producing indentations or defacement, which also permits of leakage in the use'of the valve. .l

The object of my invention is to overcome these two main objections and other minor objections found in the construction of ordinary blowoff valves and to provide a valve which will allow foreign substances or material to be removed Vand carried away through the employment of duid-pressure, thereby relnoving any material that would interfere with the proper seating of the disk or of a wearing or cutting action on the disk or its seat and the invention consists in the features and combinations hereinafter described and claimed.

In the drawings, Figure l is'asectional elevation through the valve and its working parts, showing my invention applied to a valve having a solid disk; and Fig. 2, a sectional elevation through the valve and its working parts, showing my invention in connection with a disk having discharge-passages therein.

In constructing my improved blow-off valve I employ a main shell or casing A, having on one side a neck A', ladapted for connection with the blow-off pipe direct or through an intermediate coupling or otherwise, and having also a neck A2, adapted for connection with a discharge-pipe either direct or by asage a instead of having a location just above the valve-seat can be located higher up in the wall of the main casing, so as to enter the main chamber at a point to open communication with the chamber before the final seating of the`valve-disk, as shown in Fig. 2.

The induction-port is controlled by a disk C, having a seating-face c to engage with the valve seat or packing b around the eductionport.l Asshown in Fig. l, the disk is solid and the fluid-pressure induction port or passage is located to maintain communication withl the main chamber until the disk is fully seated. f As shown in Fig. 2,. the disk is pro; vided with longitudinal passages c' for the admission of duid-pressure into thechamber in front of the disk prior to lthe final seating of the disk; but with either form of construction the fluid -pressure is to be projected against the acting face of the disk and the valve-seat for removing the dirt, sediment, and other foreign substances therefrom be'- fore the final seating of the disk. The disk in either form of construction is carried, as shown,by a stem, which has an enlargement d entering a recess or opening in the end of the disk and held in place therein by means` of a nut d', which nut, as shown, has holes for a Spanner-wrench or other device, by means of which the nut can be screwed home. The stem extends through a cap or Vcover E, which cap or cover has an opening with la screw-thread to receive the exterior screwthread on the stem, so that by turning the stem the disk can be receded and advanced to open and close the induction-port. The

end of the cap or cover is, as shown, in the form of a neck,havin gan exterior screw-thread to receive a cap or nut F, between which and IOO the end of the neck suitable packing e is located for making a tight joint. The stem is turned by means of a hand-wheel D' or a suitable handle or other device.

The valve is to be attached to the blow-off pipe from the boiler or mud-drum and to a discharge-pipe leading to the point of discharge, and the operation of the valve is as follows: The receding of the disk into the portion B3 of the main chamber and into the position shown in Fig. 1, which movement is had by turning the stem in the proper direction, opens the induction-port for the discharge of the Water and other substancesand material from the boiler or mud-drum through the induction-port and out through the eduction port or passage. The advancing of the disk by reversing the rotation or turning'of the valvefstern closes the induction-port and shuts olf the discharge from the boiler or mud-drum.

The advance of the diskin the construction and arrangement shown in Fig. l closes the induction port or passage prior to the closing of the fluid-pressure passage into the mainI chamber, so that the Huid-pressure, which can be either steam from the boiler or Water from the pump or injector or a suitable pressurefrom other sources of supply-forcibly enters and passes through thepassage or channel and'is` projected into the main chamf berover the valve-seat, striking. the face-of the disk andthe face of the valve seat-ory packing with sufficient force to carry away,A

all substances and material gathered either on the face of the disk or onthe valve-seat, and. thus `cleansethe diskand the packing or.

seat.

The advance of the disk in the construction andarrangement shown in Fig. 2 maintains the fluid-pressure passage or chan-nel vinto theY maincliamber closed until the diskhas approached the seating-point, as shown in Fig. 2, atvwhich time the duid-pressure passage or channel is open to communication with the chamber at the rear of the disk for such pressure to pass through the openin gs or passages c and be forcibly projected against the valveseat, and, as a necessaryconsequence, against the face of the disk, with sufiicientaction to carry away all material gathered on the diskand the Vvalveseat'and cleanse both ofv these parts;

The Huid-pressure in either form of construction and arrangement continues to'act until the disk is fully seated, when further action is prevented by the closingof the Huidpressure channel or passage by the diskfin the form of construction and arrangement'y of Fig. 1 and by closing the passage through the disk in the construction and arrangement shown in Fig. 2.

It will be seen that the Huid-pressure is projected in such manner as to strike the valveseat andthe face of the disk and clean therefrom the dirt, sediment, scale, or other for'- eign substances, such cleansing being had from the force and action of the fluid-pressure, which enters and passes between the seating-face of the disk and the packing or seat around the induction-port. The result of this construction and operation is that the valve can be used for a great length of time without the necessity of repairs, and a longcontinued use will not Wear the valve out, as the valve will be subjected to the natural Wear of the surfaces and not to the cutting or injurious action of any foreign substance or materia-l.l

The application of Huid-pressure to a valve for the purpose of maintaining the seatingfaces of the disk clean and clear from foreign substances and material forms the subjectmatter of and isclaimed inmy application,

engaging facefor the-valve-seat andoperating to open and fclose thesfinid-pressure pas sage and theinductiomport for the admission of thefluid-pressure. into vthe lmaincasing to operate vand cleanse the acting face of the disk and the valve-seat, substantially asdescribed.

2. In a=bloW-olf'valve, a main casingor shell provided with a chamber, avalVe-seat, an induction-port, an eduction-passage and'afluidpressure passage leading into the chamber, in combination with adisk traversing thechamber and opening and closing the fluid-pressure passage and the induction-port and provided with discharge openingsor passagesl for the admission of fi uid-pressure to act and'cleanse the acting face of'- the disk-and the valve-seat, substantially as described.

3. In a blow-off valve, a main casin g or shell provided with a chamber, a valve-seat, an induction-port, an @duction-passage and a fluidpressure passage leading into the chamber above the valve-seat, in combination with a vdisk traversing the chamber and openingand closing. the fluid-pressure passage and the induction-port and having an engaging face for the valve seat or packing for the admitted fluid-pressure to act against the face of the disk and the valve-seat to cleanse the parts, a valve-stem for moving the disk, and a cap inclosing the valve-stem, substantially as dcscribed.

FRANK M. FABER. Witnesses:

EPHRAIM BANNING, BELLE W. BARRY.

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